4.12.709 HOSE SPECIFICATION
(1) Hoses used in anhydrous ammonia service and subject to container pressure shall
conform to the joint Rubber Manufacturers Association's and the Fertilizer
Institute's "Hose Specifications for Anhydrous Ammonia" (Table B of
the Joint Association's booklet) .
(2) Hoses subject to container pressure shall be
designed for a minimum working pressure of 350 psig and a minimum burst
pressure of 1750 psig. Hose assemblies shall be capable of withstanding a test
pressure of 500 psig.
(3) Unless the manufacturer indicates otherwise,
(a) hoses from the date of manufacture shall be
changed no longer than as follows:
(i) every two years for rayon braid hoses;
(ii) every five years for stainless steel hoses.
(b) If a verification of the date of purchase or
the date the hoses were put into service is made available to the department,
then the hoses shall be changed no longer than:
(i) two years from the date of purchase or
placement into service but not to exceed three years from date of manufacture
for rayon hoses;
(ii) five years from the date of purchase or
placement into service but not to exceed six years from the date of manufacture
for stainless steel hoses.
(4) Hose and hose connections located on the low
pressure side of flow control or pressure reducing valves on devices
discharging at atmospheric pressure shall be designed for the maximum low side
working pressure. All connections shall be designed, constructed, and installed
so there will be no leakage when connected.
(5) Where liquid transfer hose is not drained
upon completion of transfer operations, such hose shall be equipped with an
approved shutoff valve at the discharge end. Provisions shall be made to
prevent excessive pressure in the hose, see ARM 4.12.710(10) .
(6) On hoses one-half inch in diameter or
larger which are used for the transfer of anhydrous ammonia liquid or vapor,
there shall be etched, cast, or impressed at five foot intervals the following
xxx psig (Maximum Working
Manufacturer's Name or
Year of Manufacture (or replacement
(7) Hoses used for transferring material (both
liquid and vapor) to and from nurse tanks shall be restricted to a 25 feet
maximum length and shall be racked when not in use to prevent undue damage to
History: Sec. 80-10-503, MCA; IMP, Sec. 80-10-503, MCA, NEW, 1986 MAR p. 1820, Eff. 10/31/86.